• 한국철도학회논문집
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• 제12권4호
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• pp.557-564
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• 2009

본 논문은 한국철도공사의 구매업무와 타기업 등의 구매관련 업무를 비교 검토하였다. 또한, 철도산업의 특성상 주요 구매물품인 철도차량 및 차량용품을 중심으로 제도 및 운영상 문제점을 파악하고 이에 대한 개선방안과 효율적 구매관리로 철도차량과 차량용품 등의 구매비용 절감방안을 제시하였다.

• 대한전기학회논문지
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• 제37권5호
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• pp.272-281
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• 1988

The problem of optimal transmission system planning is to find the most economical locations and time of transmission line construction under the various constraints such as available rights-of-way, finances, the technical characteristics of power system, and the reliability criterion of power supply, and so on. In this paper the constraint of right-of-way is represented as a finite set of available rights-of-way. And the constructed for a unit period. The electrical constraints are represented in terms of line overload and steady state stability margin. And the reliability criterion is dealt with the suppression of failure cost and with single-contingency analysis. In general, the transmission planning problem requires integer solutions and its objective function is nonlinear. In this paper the objective function is defined as a sum of the present values of construction cost and the minimum operating cost of power system. The latter is represented as a sum of generation cost and failure cost considering the change of yearly load, economic dispatch, and the line contingency. For the calculation of operating cost linear programming is adopted on the base of DC load flow calculation, and for the optimization of main objective function nonlinear Branch-and-Bound algorithm is used. Finally, for improving the efficiency of B & B algorithm a new sensitivity analysis algorithm is proposed.

• 한국실내디자인학회논문집
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• 제37호
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• pp.3-11
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• 2003

The study Is Intended to investigate and analyze the system and practice that have been applied to Interior Architecture, comparing with a number of similar foreign cases, in an attempt to seek the way toward its development as well as to come up with the solution for enhancing the competitiveness, thereby making a recommendation on how to create the desirable work environment of Interior Architecture down the road. The conclusion and recommendation we have made is highlighted as follow. Among the practical or procedural challenges in the process of improving work environment of Interior Architecture, development of current national technical qualification system in a way of further detailing the categories of Ki-sul-sa(highest engineer grade) or Ki-neung-jang(highest technician grade) as part of measures aimed at gradual approaching for improvement of design fees and rates or supervision fees will be very crucial, that calls for close coordination with the Ministry of Labor and Human Resources Development Service of Korea. In a bid to upgrade the Interior Architecture to become the part of knowledge-based industry, amendment to Korean Standard Industrial Classification along with Standard Classification of Occupations and Academic Classification will be essential, and moreover with the attitude of reflection and self-improvement, the endeavors to be able to deal with the revision of existing laws and regulations in a consistent way and manner, by forming a joint committee among the three Interior Architecture-related organizations(KOSID, ICC, KlID), will be more than important.

• 한국지능시스템학회논문지
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• 제1권3호
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• pp.20-32
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• 1991

This study seeks a way a way of dealing with unformatted natural language considering fuzzy set theory. The goal of the study is to establish a framework of an effective language understanding system that is linked to language classification system This study has found that languate understanding is strongly influenced by the language classification. The understanding of language. This study shows that the precision of language classification depends upon the way of how the language is classified in advance. In this study, a fuzzy logic was used to improve the precision of language classification. It was considered that the fuzzy logic might be albe to distinctively classify nuatural language texts into pretinent homogenious groups where contents of the language were identical. Accordingly, in the study, it was expected that classification of language were precisely classified by the fuzzy logic. An experimentalsystems was designed to evaluate the performane of a natural language understanding system that was connected to a fuzzy language classification system. Finally, the experiment suggests that a successful language understanding should require an real time interaction between mem andmachine fuzzy provious language classification.

• 한국CDE학회논문집
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• 제19권2호
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• pp.129-137
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• 2014

Due to the increase of carbon dioxide and building regulations, BIM is considered a way of low-carbon and eco-friendly building development for its many advantages. The advantages can be maximized with Open BIM since it can produce optimal results for various purposes of energy performance assessment. However there are some problems in data interoperability in the process of Open-BIM based energy performance assessment. To solve such problems, this study focuses on space boundary information interoperability between IFC of Open BIM and IDF format of Energy Plus known as the most accurate and diverse energy performance assessment. The study analyzes the analogous study then figures out the problems of IFC based energy performance analysis, and suggests the way of interoperability. Finally, the development of automation program makes this way much more effective. The study of IFC data interoperability is useful for improving the reliability of Open-BIM based energy assessment.

• 한국통신학회논문지
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• 제39C권7호
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• pp.566-572
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• 2014

본 논문에서는 다중 선박으로 구성된 해양 네트워크에서 선박 간 통신 거리를 확장하면서 전송률을 향상시키는 양방향 다중-홉 릴레이 기법을 제안한다. 제안 기법은 두 단계 디지털 네트워크 부호화를 기반으로 각 선박의 데이터 전송 순서와 네트워크 부호화 순서를 알맞게 설계하여 데이터 교환에 필요한 시간 슬롯 수를 줄인다. 모의실험 결과 제안하는 양방향 다중 홉 릴레이 기법은 기존 기법의 전송률을 약 5/3배 향상시킴을 볼 수 있다.

• 정보교육학회논문지
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• 제23권4호
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• pp.343-353
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• 2019

본 연구의 목적은 수감각이 요구되는 문제 해결과정에서 초등예비교사들이 선호하는 전략을 분석한 후, 컴퓨팅 사고력에 기반하여 수감각 능력을 향상시키는 방안을 연구함에 있다. 두 가지 다른 수감각 요소로 구성된 검사지를 이용하여 57명의 초등예비교사들이 선호하는 전략을 분석한 결과, 그들은 수감각 기반 전략보다 규칙기반 전략을 더 선호하였으며, 이러한 결과는 선행연구[13][14][20]과 일치하였다. 이러한 상황을 개선하기 위해, 분석된 결과와 CSTA와 ISTE(2011)의 9가지 컴퓨팅 사고력 요소를 활용하여 수감각 능력을 향상시킬 수 있는 방법을 제시한다.

• 대한기계학회논문집
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• 제18권1호
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• pp.232-239
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• 1994

This paper presents an effective way of improving fuel consumption for a variable displacement engine. The improvement of fuel consumption can be accomplished by means of deactivating inlet and exhaust valves, reducing the number of effective cylinders of a four-cylinder gasoline engine that is mounted on a domestic compact automobile.

• 한국분무공학회지
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• 제24권4호
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• pp.163-170
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• 2019

In this study, feedback logic using dual O₂ sensor values were developed to increase the purification capability of a three-way catalyst (TWC) in a compressed natural gas (CNG) engine. A heavy-duty inline 6-cylinder engine was used and the CNG was supplied to the engine through a mixer. This study consists of two main parts, namely, the proportional integral (PI) control with a front O₂ sensor and the feedback control with dual O₂ sensors. In the PI control experiment, effects of various parameters, such as P gain, I gain, and lean delay, on the TWC capability were identified. Based on the results of the PI control experiment, the feedback logic using dual O₂ sensor values were developed. In both cases, the nitrogen oxides (NO_X) emissions were nearly zero. However, the carbon monoxide (CO) emissions were reduced significant in the feedback logic with dual O₂ sensors than in the PI control with the front O₂ sensor.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.1685-1688
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• 2004

I propose a modeling of a mechanism for weight fire uniformity measurement of a tire and a way I interpret a Sampling signal by Loadcell through an analysis, and to measure fire uniformity in this study. Correct a weight fire uniformity measurement was possible through the production of conversion and influence factor of a signal with a basis with the model who was an oscillation mechanics enemy.